package com.qiaoba.auth.aspect;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.qiaoba.api.auth.annotation.DataScope;
import com.qiaoba.api.auth.entity.LoginUser;
import com.qiaoba.api.auth.entity.dto.RoleDTO;
import com.qiaoba.common.base.context.UserInfoContext;
import com.qiaoba.common.base.entity.param.DataScopeParam;
import lombok.RequiredArgsConstructor;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * 数据过滤处理
 *
 * @author ailanyin
 * @date 2023-09-24 16:42:08
 */
@Aspect
@Component
@RequiredArgsConstructor
public class DataScopeAspect {

    private final UserDetailsService userDetailsService;

    /**
     * 全部数据权限
     */
    public static final String DATA_SCOPE_ALL = "1";

    /**
     * 自定数据权限
     */
    public static final String DATA_SCOPE_CUSTOM = "2";

    /**
     * 部门数据权限
     */
    public static final String DATA_SCOPE_DEPT = "3";

    /**
     * 部门及以下数据权限
     */
    public static final String DATA_SCOPE_DEPT_AND_CHILD = "4";

    /**
     * 仅本人数据权限
     */
    public static final String DATA_SCOPE_SELF = "5";


    @Before("@annotation(controllerDataScope)")
    public void doBefore(JoinPoint point, DataScope controllerDataScope) throws Throwable {
        String username = UserInfoContext.getUsername();
        if (StrUtil.isBlank(username)) {
            return;
        }
        LoginUser loginUser = (LoginUser) userDetailsService.loadUserByUsername(username);
        Object[] args = point.getArgs();
        for (Object arg : args) {
            if (Objects.nonNull(arg) && arg instanceof DataScopeParam) {
                dataScopeFilter((DataScopeParam) arg, loginUser, controllerDataScope.deptAlias(), controllerDataScope.userAlias());
                break;
            }
        }

    }

    /**
     * 数据范围过滤
     *
     * @param param     入参
     * @param user      用户
     * @param deptAlias 部门别名
     * @param userAlias 用户别名
     */
    public static void dataScopeFilter(DataScopeParam param, LoginUser user, String deptAlias, String userAlias) {
        StringBuilder sqlString = new StringBuilder();
        List<String> conditions = new ArrayList<String>();

        for (RoleDTO role : user.getRoles()) {
            String dataScope = role.getDataScope();
            if (!DATA_SCOPE_CUSTOM.equals(dataScope) && conditions.contains(dataScope)) {
                continue;
            }

            if (DATA_SCOPE_ALL.equals(dataScope)) {
                sqlString = new StringBuilder();
                conditions.add(dataScope);
                break;
            } else if (DATA_SCOPE_CUSTOM.equals(dataScope)) {
                sqlString.append(StrUtil.format(
                        " OR {}.dept_id IN ( SELECT dept_id FROM sys_role_dept WHERE role_id = '{}' ) ", deptAlias,
                        role.getRoleId()));
            } else if (DATA_SCOPE_DEPT.equals(dataScope)) {
                sqlString.append(StrUtil.format(" OR {}.dept_id = '{}' ", deptAlias, user.getDeptId()));
            } else if (DATA_SCOPE_DEPT_AND_CHILD.equals(dataScope)) {
                sqlString.append(StrUtil.format(
                        " OR {}.dept_id IN ( SELECT dept_id FROM sys_dept WHERE dept_id = {} or find_in_set( {} , ancestors ) )",
                        deptAlias, user.getDeptId(), user.getDeptId()));
            } else if (DATA_SCOPE_SELF.equals(dataScope)) {
                if (StrUtil.isNotBlank(userAlias)) {
                    sqlString.append(StrUtil.format(" OR {}.user_id = '{}' ", userAlias, user.getUserId()));
                } else {
                    // 数据权限为仅本人且没有userAlias别名不查询任何数据
                    sqlString.append(StrUtil.format(" OR {}.dept_id = '0' ", deptAlias));
                }
            }
            conditions.add(dataScope);
        }

        // 多角色情况下，所有角色都不包含传递过来的权限字符，这个时候sqlString也会为空，所以要限制一下,不查询任何数据
        if (CollUtil.isEmpty(conditions)) {
            sqlString.append(StrUtil.format(" OR {}.dept_id = '0' ", deptAlias));
        }

        if (StrUtil.isNotBlank(sqlString)) {
            param.setDataScope(" AND (" + sqlString.substring(4) + ")");
        }
    }

}
